O₃ oxidation excited by yellow phosphorus emulsion coupling with red mud absorption for denitration

Area of Science:

• Environmental Chemistry
• Industrial Emissions Control
• Catalysis

Background:

• Nitrogen oxides (NOx) are major industrial pollutants contributing to environmental issues.
• Existing NOx removal methods often face challenges with efficiency and cost-effectiveness.
• Developing novel absorbents is crucial for effective industrial emission control.

Purpose of the Study:

• To investigate the efficacy of a novel composite absorbent for industrial NOx removal.
• To optimize the denitration process using yellow phosphorus (P4) emulsion and red mud slurry.
• To elucidate the reaction mechanism of NOx conversion.

Main Methods:

• Utilized yellow phosphorus (P4) emulsion and red mud slurry as a composite absorbent.
• Investigated single factors influencing denitration efficiency, including P4 concentration, temperature, stirring, gas flow rate, O2 content, and red mud ratio.
• Employed Response Surface Methodology (RSM) for process parameter optimization.

Main Results:

• Achieved a high NOx removal rate of 99.3% under optimized conditions.
• Yellow phosphorus (P4) stimulated ozone (O3) formation, facilitating NO oxidation.
• Red mud acted as a pH buffer, enhancing NOx absorption.
• NOx was converted to water-soluble NO2- and NO3-, while P4 transformed into PO43-.

Conclusions:

• The composite absorbent of yellow phosphorus (P4) and red mud is highly effective for industrial NOx removal.
• Process optimization via RSM significantly enhanced denitration efficiency.
• The study provides insights into the reaction mechanism for NOx abatement.